1285663 has 8 divisors (see below), whose sum is σ = 1349120. Its totient is φ = 1223640.

The previous prime is 1285649. The next prime is 1285679. The reversal of 1285663 is 3665821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

1285663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1768 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (168640).

2^1285663 is an apocalyptic number.

1285663 is a deficient number, since it is larger than the sum of its proper divisors (63457).

1285663 is an equidigital number, since it uses as much as digits as its factorization.

1285663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717.

The product of its digits is 8640, while the sum is 31.

The square root of 1285663 is about 1133.8708039279. The cubic root of 1285663 is about 108.7365914679.

The spelling of 1285663 in words is "one million, two hundred eighty-five thousand, six hundred sixty-three".